[analyzer] Eliminate unique release point assertion (#150240)

MallocChecker.cpp has a complex heuristic that supresses reports where
the memory release happens during the release of a reference-counted
object (to suppress a significant amount of false positives).

Previously this logic asserted that there is at most one release point
corresponding to a symbol, but it turns out that there is a rare corner
case where the symbol can be released, forgotten and then released
again. This commit removes that assertion to avoid the crash. (As this
issue just affects a bug suppression heuristic, I didn't want to dig
deeper and modify the way the state of the symbol is changed.)

Fixes #149754

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